I have two pbx’s configured for inter-company dialing by extensions with a PJSIP trunk. When company A dials company B via extension, it works fine and vise versa. However if a user at company B has their phone forwarded to their cell phone and company A calls, they get a “Your call cannot be completed as dialed”. I am thinking this has something to do with the inter-company sip trunk not being allowed to use the outbound route. Am I on the right track or should I look at something else?